I have a SNES and would like to play jap games but I want them to be in english and I want to play them on my snes on a normal cart. There is a person on ebay selling copies of Secret of Mana 2 that is done this way. can someone help me

Or you could buy a SNES flashcart. There's a few available, but the addon chips they support vary. The newest one I've seen, but still being worked on atm, supports most of them. http://sd2snes.de/blog/status

TBH, Flash carts generally are the best way to play rom hacks on the real hardware, as long as the game doesn't use any specific add-on chips like the SNES Super FX chip. However, they usually aren't very reliable, and for a long-term solution, it would be best to make your own or buy repros.